Organising my Python project

Create an __init__.py file in your projects folder, and it will be treated like a module by Python.

Classes in your package directory can then be imported using syntax like:

from package import classimport package.class

Within __init__.py, you may create an __all__ array that defines from package import * behavior:

# name1 and name2 will be available in calling module's namespace # when using "from package import *" syntax__all__ = ['name1', 'name2'] 

And here is way more information than you even want to know about packages in Python

Generally speaking, a good way to learn about how to organize a lot of code is to pick a popular Python package and see how they did it. I'd check out Django and Twisted, for starters.

"As is good practice I want to put them in a separate file each. "

This is not actually a very good practice. You should design modules that contain closely-related classes.

As a practical matter, no class actually stands completely alone. Generally classes come in clusters or groups that are logically related.

Python doesn't force you into Java's nasty one-class-per-file style. In fact, it's not even considered good style to put each class in a separate file unless they are huge. (If they are huge, you probably have to do refactoring anyway.) Instead, you should group similar classes and functions in modules. For example, if you are writing a GUI calculator, your package layout might look like this:

/amazingcalc   /__init__.py # This makes it a Python package and importable.   /evaluate.py # Contains the code to actually do calculations.   /main.py # Starts the application   /ui.py # Contains the code to make a pretty interface